Micah Johnson was obviously signed as a replacement for A. J. Edds on the depth chart, as the fourth-round rookie suffered a season-ending torn ACL in last night's practice.

So why was it Oglesby, and not Edds, who was taken off the Dolphins' 80-man roster to make room for Johnson?

Quite simply, because of the Dolphins would have had to expose Edds to waivers before placing him on injured reserve now, and he most likely would have been claimed by another team.

NFL rules prohibit placing non-vested veterans on a reserve list before the cut down to 75 players, which this year is Aug. 31. This is to prevent teams from "stashing" developmental players on reserve lists and freeing up roster spots for other players during the preseason.

Last August, Cleveland Browns rookie sixth-round cornerback Don Carey suffered a season-ending shoulder injury in camp and was waived/injured in order to get him off the active roster and onto injured reserve.

However, the Jacksonville Jaguars opted to claim Carey off waivers and keep him on their active roster until the 75-man cuts, when they placed on directly on I.R.

To prevent such a thing happening with Edds, the Dolphins will have to carry him on the active roster until Aug. 31 in order to put him on injured reserve without first exposing him to waivers.

Until then, expect Edds to remain on the Dolphins' active 80-man roster despite his season-ending injury.